【摘要】 针对多载波码分多址 (MC CDMA)系统包络变化剧烈 ,必须采用线性放大器进行放大的特点 ,分析了决定MC CDMA包络特性的因素 .通过分析 ,可以看出 ,MC CDMA系统的包络特性不只决定于系统内各个用户的伪随机扩频码的自相关特性 ,而且与各个用户码的互相关特性有密切关系 ,但与各个用户的信息码序列无关 .适用于室内环境的MC CDMA系统 ,对于扩频码的数量要求不高 ,若能够选取一些数量尽管不多但相关特性较好的码 ,对于改善其信号包络的动态特性有非常明显的作用更多还原

【Abstract】 A MC CDMA signal has to be amplified using linear amplifier for its huge dynamic range.This paper analyses the envelope character of the MC CDMA signal,and concludes that the envelope character of the MC CDMA signal not only depends on the auto correlation of every user’s spread code,but also depends on the cross correlation of the codes,and has nothing to do with the user’s information bits.Because the MC CDMA is suitable for indoor situation,it needs few spread code.The MC CDMA signal’s envelope character can be improved significantly if we choose a small set of spread code with good correlation character.更多还原